I connected my nexus 7 to my PC by typing the airdroid URL into the IE window, with the intention of transferring a file. A drag and drop option appeared and I dragged the file from nexus documents folder and dropped it into the indicated window ("Drag & Drop files or folders here to upload") . It disappeared from the nexus but did not appear in the window. I cannot now find it anywhere. Is it lost?

To help us better troubleshoot it, would you please tell us that did you transfer the file as shown in the following screenshot? If not, would you please send us a screenshot for us to better understand.

Would you please check other folder to see if the file has been transferred to other folder mistakenly?